If you think Star is really cute, it won't actually matter the episodes you watch. That's why I watched it, not for a plot that, at the time, didn't even exist. I'd just go along for the ride from EP 1. But keep in mind, the change in animation studios is pretty apparent, but some people actually like the new style, so its really just how you like the look of it.
Honestly, that's not that thin of a reason. Star is beyond adorable and her personality makes her really shine. If you like her as the main reason to watch the show, you'll probably even enjoy some of the weaker episodes.